<!--
 * @Author: 胡海
 * @Date: 2020-08-29 13:09:52
 * @LastEditors: 胡海
 * @LastEditTime: 2020-09-05 08:12:27
 * @Description: 
-->
<template>
  <div class="shopcart">
    <div class="content" @click="toggleList">
      <div class="content-left">
        <div class="logo-wrapper">
          <div class="logo" :class="{'highlight':totalCount>0}">
            <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
          </div>
          <div class="num" v-show="totalCount>0">{{totalCount}}</div>
        </div>
        <div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}</div>
        <div class="desc">另需配送费￥{{deliveryPrice}}元</div>
      </div>
      <div class="content-right" @click.stop.prevent="pay">
        <div class="pay" :class="payClass">
          {{payDesc}}
        </div>
      </div>
    </div>
    <div class="ball-container" v-el:list-content>
        <div transition="drop" v-for="ball in balls" v-show="ball.show" class="ball">
            <div class="inner inner-hook"></div>
        </div>
      </div>
    <div class="shopcart-list" v-show="listShow" transition="fold">
      <div class="list-header">
        <h1 class="title">购物车</h1>
        <span class="empty" @click="empty">清空</span>
      </div>
      <div class="list-content" v-el:list-content>
        <ul>
          <li class="food" v-for="food in selectFoods">
            <span class="name">{{food.name}}</span>
            <div class="price">
              <span>￥{{food.price*food.count}}</span>
            </div>
            <div class="cartcontrol-wrapper">
              <cartcontrol :food="food"></cartcontrol>
            </div>
            </li>
          </ul>
        </div>
      </div>
  </div>
  <div class="list-mask" @click="hideList" v-show="listShow" transition="fade"></div>
</template>

<script  type="text/ecmascript-6">
import BScroll from 'better-scroll';
import cartcontrol from 'components/cartcontrol/cartcontrol';
export default {
  props: {
    selectFoods: {
      type: Array,
      default() {
        return [
          {
            price: 10,
            count: 1
          }
        ];
      }
    },
    deliveryPrice: {
      type: Number,
      default: 0
    },
    minPrice: {
      type: Number,
      default: 20
    }
  },
  data() {
    return {
      balls: [
        {
           show: false
        },
         {
           show: false
        },
         {
           show: false
        },
         {
           show: false
        },
         {
           show: false
        },
      ],
      dropBalls: [],
      fold: true
    };
  },
  computed: {
    totalPrice() {
      let total = 0;
      this.selectFoods.forEach((food) => {
        total += food.price * food.count;
      });
       return total;
    },
    totalCount() {
      let count = 0;
      this.selectFoods.forEach((food) => {
        count += food.count;
      });
      return count;
    },
    payDesc() {
      if (this.totalPrice === 0) {
        return `￥${this.minPrice}元起送`;
      }else if(this.totalPrice<this.minPrice){
        let diff = this.minPrice - this.totalPrice;
        return `还差￥${diff}元起送`;
      }else{
        return '去结算';
      }
    },
    payClass() {
      if(this.totalPrice < this.minPrice){
        return 'not-enough';
      } else {
        return 'enough';
      }
    },
    listShow() {
      if (!this.totalCount) {
        this.fold = true;
        return false;
      }
      let show = !this.fold;
      if (show) {
        this.$nextTick(() => {
          if(!this.scroll) {
            this.scroll = new BScroll(this.$els.listContent, {
            click: true
          });
          }else{
            this.scroll.refresh();
          }
        });
      }
      return show;
    }
  },   
  methods: {
    drop(el) {
     for (let i = 0; i < this.balls.length; i++) {
       let ball = this.balls[i];
       if (!ball.show) {
         ball.show = true;
         ball.el = el;
         this.dropBalls.push(ball);
         return;
       }
     }
    },
    toggleList() {
      if(!this.totalCount) {
        return;
      }
      this.fold = !this.fold;
    },
    hideList() {
      this.fold = true;
    },
    empty() {
      this.selectFoods.forEach((food) => {
        food.count = 0;
      });
    },
    pay() {
      if (this.totalPrice < this.minPrice) {
        return;
      }
      window.alert(`支付${this.totalPrice}元`);
    }
  },
 transitions: {
    drop: {
      beforeEnter(el) {
          let count = this.balls.length;
          while (count--) {
            let ball = this.balls[count];
            if (ball.show) {
              let rect = ball.el.getBoundingClientRect();
              let x = rect.left - 32;
              let y = -(window.innerHeight - rect.top - 22);
              el.style.display = '';
              el.style.webkitTransform = `translate3d(0,${y}px,0)`;
              el.style.transform = `translate3d(0,${y}px,0)`;
              let inner = el.getElementsByClassName('inner-hook')[0];
              inner.style.webkitTransform = `translate3d(${x}px,0,0)`;
              inner.style.transform = `translate3d(${x}px,0,0)`;
            }
          }
        },
        enter(el) {
          /* eslint-disable no-unused-vars */
          let rf = el.offsetHeight;
          this.$nextTick(() => {
            el.style.webkitTransform = 'translate3d(0,0,0)';
            el.style.transform = 'translate3d(0,0,0)';
            let inner = el.getElementsByClassName('inner-hook')[0];
            inner.style.webkitTransform = 'translate3d(0,0,0)';
            inner.style.transform = 'translate3d(0,0,0)';
          });
        },
      afterEnter(el) {
        let ball = this.dropBalls.shift();
        if (ball) {
          ball.show = false;
          el.style.display = 'none';
        }
      }
    }
  },
 components: {
    cartcontrol
  }
};
</script>

 <style  lang="stylus" rel="stylesheet/stylus">
 @import "../../common/stylus/mixin"
 
 .shopcart
    position: fixed
    left: 0 
    bottom: 0  
    z-index: 50
    width: 100%
    height: 48px 
    .content
      display: flex
      background: #141d21 
      font-size: 0 
      .content-left
        flex: 1
        .logo-wrapper
          display: inline-block
          position: relative
          top: -10px 
          margin: 0 12px 
          padding: 6px
          width: 56px 
          height: 56px 
          box-sizing: border-box
          vertical-align: top
          border-radius: 50% 
          background: #141d21 
          .logo
            width: 100%
            height: 100%
            border-radius: 50%
            background: #2b343c  
            text-align: center 
            &.highlight
              background: rgb(0, 160, 220) 
            .icon-shopping_cart
              line-height: 44px 
              font-size: 24px 
              color: #80858a 
              &.highlight
                color: #fff 
          .num    
            position: absolute
            top: 0
            right: 0
            width: 24px 
            height: 16px  
            line-height: 16px 
            text-align: center
            border-radius: 16px 
            font-size: 9px 
            font-weight: 700 
            color: #fff
            background: rgb(240, 20, 20)
            box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.4)  
        .price 
          display: inline-block
          vertical-align: top
          margin-top: 12px 
          line-height: 24px
          padding-right: 12px  
          box-sizing: border-box
          border-right: 1px solid rgba(255, 255, 255, 0.1) 
          font-size: 16px 
          font-weight: 700 
          color: rgba(255,255,255,0.4) 
          &.highlight
            color: #fff
        .desc 
          display: inline-block 
          vertical-align: top
          line-height: 24px
          margin: 12px 0 0 12px 
          color: rgba(255,255,255,0.4) 
          font-size: 10px 
      .content-right
         flex: 0 0 105px
         width: 105px
         .pay
          height: 48px 
          line-height: 48px 
          text-align: center
          font-size: 12px 
          color: rgba(255,255,255,0.4)  
          font-weight: 700 
          background: #2b332b 
          &.not-enough
            background: #2b332b
          &.enough  
            background: #00b43c
            color: #fff 
    .ball-container        
      .ball
        position: fixed
        left: 32px 
        bottom: 22px 
        z-index: 200 
        &.drop-transition
          transition: all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
          .inner
            width: 16px 
            height: 16px 
            border-radius: 50%
            background: rgb(0, 160, 220)  
            transition: all 0.4s linear 
    .shopcart-list
      position: absolute 
      left: 0
      top: 0
      z-index: -1  
      width: 100% 
      &.fold-transition
        transition: all 0.5s
        transform: translate3d(0, -100%, 0) 
      &.fold-enter, &.fold-leave
        transform: translate3d(0, 0, 0) 
      .list-header
        height: 40px 
        line-height: 40px 
        padding: 0 18px
        background: #f3f5f7
        border-bottom: 1px solid rgba(7, 17, 27, 0.1)
        .title
          float: left 
          font-size: 14px
          color: rgb(7, 17, 27) 
        .empty
          float: right 
          font-size: 12px  
          color: rgb(0, 160, 220)
      .list-content
        padding: 0 18px 
        max-height: 217px 
        overflow: hidden
        background: #fff  
        .food
          position: relative
          padding: 12px 0 
          box-sizing: border-box
          border-1px(rgba(7, 17, 27,0.1))
          .name
           line-height: 24px 
           font-size: 14px 
           color: rgb(7, 17, 27) 
          .price
           position: absolute
           right: 90px 
           bottom: 12px
           line-height: 24px 
           font-size: 14px
           font-weight: 700
           color: rgb(240, 20, 20)
          .cartcontrol-wrapper
            position: absolute
            right: 0 
            bottom: 6px 
 .list-mask
   position: fixed
   top: 0
   left: 0
   width: 100%
   height: 100%
   z-index: 40
   backdrop-filter: blur(10px) 
   &.fade-transition
     transition: all 0.5s 
     opacity: 1
     background: rgba(7, 17, 27, 0.6)   
   &.fade-enter, &.fade-leave
     opacity: 0
     background: rgba(7, 17, 27, 0) 
</style>